80820449 has 4 divisors (see below), whose sum is σ = 81000900. Its totient is φ = 80640000.

The previous prime is 80820437. The next prime is 80820457. The reversal of 80820449 is 94402808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70140625 + 10679824 = 8375^2 + 3268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80820449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80820149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89552 + ... + 90449.

It is an arithmetic number, because the mean of its divisors is an integer number (20250225).

Almost surely, 2^80820449 is an apocalyptic number.

It is an amenable number.

80820449 is a deficient number, since it is larger than the sum of its proper divisors (180451).

80820449 is a wasteful number, since it uses less digits than its factorization.

80820449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180450.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 80820449 is about 8990.0194104351. The cubic root of 80820449 is about 432.3549341412.

The spelling of 80820449 in words is "eighty million, eight hundred twenty thousand, four hundred forty-nine".